var ali=document.querySelectorAll('#lbt ul li')
			var index=0
			
			setInterval(move,3000)
			
			lastindex=0
			function move(){
				index++
				if(index==ali.length){
					index=0
				}
				ali[lastindex].className=''
				ali[index].className='active'
				
				lastindex=index
			}